text: // Copyright 2014 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #include "cc/blink/web_layer_impl.h"
  
  #include <stddef.h>
  #include <stdint.h>
  
  #include <utility>
  #include <vector>
  
  #include "base/bind.h"
  #include "base/strings/string_util.h"
  #include "base/threading/thread_checker.h"
  #include "base/trace_event/trace_event_impl.h"
  #include "cc/base/region.h"
  #include "cc/base/switches.h"
  #include "cc/blink/web_blend_mode.h"
  #include "cc/layers/layer.h"
  #include "cc/layers/layer_position_constraint.h"
  #include "cc/trees/element_id.h"
  #include "cc/trees/layer_tree_host.h"
  #include "third_party/WebKit/public/platform/WebFloatPoint.h"
  #include "third_party/WebKit/public/platform/WebFloatRect.h"
  #include "third_party/WebKit/public/platform/WebLayerPositionConstraint.h"
  #include "third_party/WebKit/public/platform/WebLayerScrollClient.h"
  #include "third_party/WebKit/public/platform/WebLayerStickyPositionConstraint.h"
  #include "third_party/WebKit/public/platform/WebSize.h"
  #include "third_party/skia/include/core/SkMatrix44.h"
  #include "ui/gfx/geometry/rect_conversions.h"
  #include "ui/gfx/geometry/vector2d_conversions.h"
  
  using cc::Layer;
  using blink::WebLayer;
  using blink::WebFloatPoint;
  using blink::WebVector;
  using blink::WebRect;
  using blink::WebSize;
  using blink::WebColor;
  
  namespace cc_blink {
  
  WebLayerImpl::WebLayerImpl()
      : layer_(Layer::Create()), contents_opaque_is_fixed_(false) {}
  
  WebLayerImpl::WebLayerImpl(scoped_refptr<Layer> layer)
      : layer_(layer), contents_opaque_is_fixed_(false) {
  }
  
  WebLayerImpl::~WebLayerImpl() {
    layer_->SetLayerClient(nullptr);
  }
  
  int WebLayerImpl::id() const {
    return layer_->id();
  }
  
  DISABLE_CFI_PERF
  void WebLayerImpl::invalidateRect(const blink::WebRect& rect) {
    layer_->SetNeedsDisplayRect(rect);
  }
  
  void WebLayerImpl::invalidate() {
    layer_->SetNeedsDisplay();
  }
  
  void WebLayerImpl::addChild(WebLayer* child) {
    layer_->AddChild(static_cast<WebLayerImpl*>(child)->layer());
  }
  
  void WebLayerImpl::insertChild(WebLayer* child, size_t index) {
    layer_->InsertChild(static_cast<WebLayerImpl*>(child)->layer(), index);
  }
  
  void WebLayerImpl::replaceChild(WebLayer* reference, WebLayer* new_layer) {
    layer_->ReplaceChild(static_cast<WebLayerImpl*>(reference)->layer(),
                         static_cast<WebLayerImpl*>(new_layer)->layer());
  }
  
  void WebLayerImpl::removeFromParent() {
    layer_->RemoveFromParent();
  }
  
  void WebLayerImpl::removeAllChildren() {
    layer_->RemoveAllChildren();
  }
  
  void WebLayerImpl::setBounds(const WebSize& size) {
    layer_->SetBounds(size);
  }
  
  WebSize WebLayerImpl::bounds() const {
    return layer_->bounds();
  }
  
  void WebLayerImpl::setMasksToBounds(bool masks_to_bounds) {
    layer_->SetMasksToBounds(masks_to_bounds);
  }
  
  bool WebLayerImpl::masksToBounds() const {
    return layer_->masks_to_bounds();
  }
  
  void WebLayerImpl::setMaskLayer(WebLayer* maskLayer) {
    layer_->SetMaskLayer(
        maskLayer ? static_cast<WebLayerImpl*>(maskLayer)->layer() : 0);
  }
  
  void WebLayerImpl::setOpacity(float opacity) {
    layer_->SetOpacity(opacity);
  }
  
  float WebLayerImpl::opacity() const {
    return layer_->opacity();
  }
  
  void WebLayerImpl::setBlendMode(blink::WebBlendMode blend_mode) {
    layer_->SetBlendMode(BlendModeToSkia(blend_mode));
  }
  
  blink::WebBlendMode WebLayerImpl::blendMode() const {
    return BlendModeFromSkia(layer_->blend_mode());
  }
  
  void WebLayerImpl::setIsRootForIsolatedGroup(bool isolate) {
    layer_->SetIsRootForIsolatedGroup(isolate);
  }
  
  bool WebLayerImpl::isRootForIsolatedGroup() {
    return layer_->is_root_for_isolated_group();
  }
  
  void WebLayerImpl::setOpaque(bool opaque) {
    if (contents_opaque_is_fixed_)
      return;
    layer_->SetContentsOpaque(opaque);
  }
  
  bool WebLayerImpl::opaque() const {
    return layer_->contents_opaque();
  }
  
  void WebLayerImpl::setPosition(const WebFloatPoint& position) {
    layer_->SetPosition(position);
  }
  
  WebFloatPoint WebLayerImpl::position() const {
    return layer_->position();
  }
  
  void WebLayerImpl::setTransform(const SkMatrix44& matrix) {
    gfx::Transform transform;
    transform.matrix() = matrix;
    layer_->SetTransform(transform);
  }
  
  void WebLayerImpl::setTransformOrigin(const blink::WebFloatPoint3D& point) {
    gfx::Point3F gfx_point = point;
    layer_->SetTransformOrigin(gfx_point);
  }
  
  blink::WebFloatPoint3D WebLayerImpl::transformOrigin() const {
    return layer_->transform_origin();
  }
  
  SkMatrix44 WebLayerImpl::transform() const {
    return layer_->transform().matrix();
  }
  
  void WebLayerImpl::setDrawsContent(bool draws_content) {
    layer_->SetIsDrawable(draws_content);
  }
  
  bool WebLayerImpl::drawsContent() const {
    return layer_->DrawsContent();
  }
  
  void WebLayerImpl::setDoubleSided(bool double_sided) {
    layer_->SetDoubleSided(double_sided);
  }
  
  void WebLayerImpl::setShouldFlattenTransform(bool flatten) {
    layer_->SetShouldFlattenTransform(flatten);
  }
  
  void WebLayerImpl::setRenderingContext(int context) {
    layer_->Set3dSortingContextId(context);
  }
  
  void WebLayerImpl::setUseParentBackfaceVisibility(
      bool use_parent_backface_visibility) {
    layer_->SetUseParentBackfaceVisibility(use_parent_backface_visibility);
  }
  
  void WebLayerImpl::setBackgroundColor(WebColor color) {
    layer_->SetBackgroundColor(color);
  }
  
  WebColor WebLayerImpl::backgroundColor() const {
    return layer_->background_color();
  }
  
  void WebLayerImpl::setFilters(const cc::FilterOperations& filters) {
    layer_->SetFilters(filters);
  }
  
  void WebLayerImpl::setFiltersOrigin(const blink::WebFloatPoint& origin) {
    layer_->SetFiltersOrigin(origin);
  }
  
  void WebLayerImpl::setBackgroundFilters(const cc::FilterOperations& filters) {
    layer_->SetBackgroundFilters(filters);
  }
  
  bool WebLayerImpl::hasActiveAnimationForTesting() {
    return layer_->HasActiveAnimationForTesting();
  }
  
  void WebLayerImpl::setScrollPositionDouble(blink::WebDoublePoint position) {
    layer_->SetScrollOffset(gfx::ScrollOffset(position.x, position.y));
  }
  
  blink::WebDoublePoint WebLayerImpl::scrollPositionDouble() const {
    return blink::WebDoublePoint(layer_->scroll_offset().x(),
                                 layer_->scroll_offset().y());
  }
  
  void WebLayerImpl::setScrollClipLayer(WebLayer* clip_layer) {
    if (!clip_layer) {
      layer_->SetScrollClipLayerId(Layer::INVALID_ID);
      return;
    }
    layer_->SetScrollClipLayerId(clip_layer->id());
  }
  
  bool WebLayerImpl::scrollable() const {
    return layer_->scrollable();
  }
  
  void WebLayerImpl::setUserScrollable(bool horizontal, bool vertical) {
    layer_->SetUserScrollable(horizontal, vertical);
  }
  
  bool WebLayerImpl::userScrollableHorizontal() const {
    return layer_->user_scrollable_horizontal();
  }
  
  bool WebLayerImpl::userScrollableVertical() const {
    return layer_->user_scrollable_vertical();
  }
  
  void WebLayerImpl::addMainThreadScrollingReasons(
      uint32_t main_thread_scrolling_reasons) {
    // WebLayerImpl should only know about non-transient scrolling
    // reasons. Transient scrolling reasons are computed per hit test.
    DCHECK(main_thread_scrolling_reasons);
    DCHECK(cc::MainThreadScrollingReason::MainThreadCanSetScrollReasons(
        main_thread_scrolling_reasons));
    layer_->AddMainThreadScrollingReasons(main_thread_scrolling_reasons);
  }
  
  void WebLayerImpl::clearMainThreadScrollingReasons(
      uint32_t main_thread_scrolling_reasons_to_clear) {
    layer_->ClearMainThreadScrollingReasons(
        main_thread_scrolling_reasons_to_clear);
  }
  
  uint32_t WebLayerImpl::mainThreadScrollingReasons() {
    return layer_->main_thread_scrolling_reasons();
  }
  
  bool WebLayerImpl::shouldScrollOnMainThread() const {
    return layer_->should_scroll_on_main_thread();
  }
  
  void WebLayerImpl::setNonFastScrollableRegion(const WebVector<WebRect>& rects) {
    cc::Region region;
    for (size_t i = 0; i < rects.size(); ++i)
      region.Union(rects[i]);
    layer_->SetNonFastScrollableRegion(region);
  }
  
  WebVector<WebRect> WebLayerImpl::nonFastScrollableRegion() const {
    size_t num_rects = 0;
    for (cc::Region::Iterator region_rects(layer_->non_fast_scrollable_region());
         region_rects.has_rect();
         region_rects.next())
      ++num_rects;
  
    WebVector<WebRect> result(num_rects);
    size_t i = 0;
    for (cc::Region::Iterator region_rects(layer_->non_fast_scrollable_region());
         region_rects.has_rect();
         region_rects.next()) {
      result[i] = region_rects.rect();
      ++i;
    }
    return result;
  }
  
  void WebLayerImpl::setTouchEventHandlerRegion(const WebVector<WebRect>& rects) {
    cc::Region region;
    for (size_t i = 0; i < rects.size(); ++i)
      region.Union(rects[i]);
    layer_->SetTouchEventHandlerRegion(region);
  }
  
  WebVector<WebRect> WebLayerImpl::touchEventHandlerRegion() const {
    size_t num_rects = 0;
    for (cc::Region::Iterator region_rects(layer_->touch_event_handler_region());
         region_rects.has_rect();
         region_rects.next())
      ++num_rects;
  
    WebVector<WebRect> result(num_rects);
    size_t i = 0;
    for (cc::Region::Iterator region_rects(layer_->touch_event_handler_region());
         region_rects.has_rect();
         region_rects.next()) {
      result[i] = region_rects.rect();
      ++i;
    }
    return result;
  }
  
  void WebLayerImpl::setIsContainerForFixedPositionLayers(bool enable) {
    layer_->SetIsContainerForFixedPositionLayers(enable);
  }
  
  bool WebLayerImpl::isContainerForFixedPositionLayers() const {
    return layer_->IsContainerForFixedPositionLayers();
  }
  
  static blink::WebLayerPositionConstraint ToWebLayerPositionConstraint(
      const cc::LayerPositionConstraint& constraint) {
    blink::WebLayerPositionConstraint web_constraint;
    web_constraint.isFixedPosition = constraint.is_fixed_position();
    web_constraint.isFixedToRightEdge = constraint.is_fixed_to_right_edge();
    web_constraint.isFixedToBottomEdge = constraint.is_fixed_to_bottom_edge();
    return web_constraint;
  }
  
  static cc::LayerPositionConstraint ToLayerPositionConstraint(
      const blink::WebLayerPositionConstraint& web_constraint) {
    cc::LayerPositionConstraint constraint;
    constraint.set_is_fixed_position(web_constraint.isFixedPosition);
    constraint.set_is_fixed_to_right_edge(web_constraint.isFixedToRightEdge);
    constraint.set_is_fixed_to_bottom_edge(web_constraint.isFixedToBottomEdge);
    return constraint;
  }
  
  void WebLayerImpl::setPositionConstraint(
      const blink::WebLayerPositionConstraint& constraint) {
    layer_->SetPositionConstraint(ToLayerPositionConstraint(constraint));
  }
  
  blink::WebLayerPositionConstraint WebLayerImpl::positionConstraint() const {
    return ToWebLayerPositionConstraint(layer_->position_constraint());
  }
  
  static blink::WebLayerStickyPositionConstraint
  ToWebLayerStickyPositionConstraint(
      const cc::LayerStickyPositionConstraint& constraint) {
    blink::WebLayerStickyPositionConstraint web_constraint;
    web_constraint.isSticky = constraint.is_sticky;
    web_constraint.isAnchoredLeft = constraint.is_anchored_left;
    web_constraint.isAnchoredRight = constraint.is_anchored_right;
    web_constraint.isAnchoredTop = constraint.is_anchored_top;
    web_constraint.isAnchoredBottom = constraint.is_anchored_bottom;
    web_constraint.leftOffset = constraint.left_offset;
    web_constraint.rightOffset = constraint.right_offset;
    web_constraint.topOffset = constraint.top_offset;
    web_constraint.bottomOffset = constraint.bottom_offset;
    web_constraint.parentRelativeStickyBoxOffset =
        constraint.parent_relative_sticky_box_offset;
    web_constraint.scrollContainerRelativeStickyBoxRect =
        constraint.scroll_container_relative_sticky_box_rect;
    web_constraint.scrollContainerRelativeContainingBlockRect =
        constraint.scroll_container_relative_containing_block_rect;
    return web_constraint;
  }
  static cc::LayerStickyPositionConstraint ToStickyPositionConstraint(
      const blink::WebLayerStickyPositionConstraint& web_constraint) {
    cc::LayerStickyPositionConstraint constraint;
    constraint.is_sticky = web_constraint.isSticky;
    constraint.is_anchored_left = web_constraint.isAnchoredLeft;
    constraint.is_anchored_right = web_constraint.isAnchoredRight;
    constraint.is_anchored_top = web_constraint.isAnchoredTop;
    constraint.is_anchored_bottom = web_constraint.isAnchoredBottom;
    constraint.left_offset = web_constraint.leftOffset;
    constraint.right_offset = web_constraint.rightOffset;
    constraint.top_offset = web_constraint.topOffset;
    constraint.bottom_offset = web_constraint.bottomOffset;
    constraint.parent_relative_sticky_box_offset =
        web_constraint.parentRelativeStickyBoxOffset;
    constraint.scroll_container_relative_sticky_box_rect =
        web_constraint.scrollContainerRelativeStickyBoxRect;
    constraint.scroll_container_relative_containing_block_rect =
        web_constraint.scrollContainerRelativeContainingBlockRect;
    return constraint;
  }
  void WebLayerImpl::setStickyPositionConstraint(
      const blink::WebLayerStickyPositionConstraint& constraint) {
    layer_->SetStickyPositionConstraint(ToStickyPositionConstraint(constraint));
  }
  blink::WebLayerStickyPositionConstraint WebLayerImpl::stickyPositionConstraint()
      const {
    return ToWebLayerStickyPositionConstraint(
        layer_->sticky_position_constraint());
  }
  
  void WebLayerImpl::setScrollClient(blink::WebLayerScrollClient* scroll_client) {
    if (scroll_client) {
      layer_->set_did_scroll_callback(
          base::Bind(&blink::WebLayerScrollClient::didScroll,
                     base::Unretained(scroll_client)));
    } else {
      layer_->set_did_scroll_callback(base::Closure());
    }
  }
  
  void WebLayerImpl::setLayerClient(cc::LayerClient* client) {
    layer_->SetLayerClient(client);
  }
  
  const cc::Layer* WebLayerImpl::ccLayer() const {
    return layer_.get();
  }
  
  cc::Layer* WebLayerImpl::ccLayer() {
    return layer_.get();
  }
  
  void WebLayerImpl::setElementId(const cc::ElementId& id) {
    layer_->SetElementId(id);
  }
  
  cc::ElementId WebLayerImpl::elementId() const {
    return layer_->element_id();
  }
  
  void WebLayerImpl::setCompositorMutableProperties(uint32_t properties) {
    layer_->SetMutableProperties(properties);
  }
  
  uint32_t WebLayerImpl::compositorMutableProperties() const {
    return layer_->mutable_properties();
  }
  
  void WebLayerImpl::setScrollParent(blink::WebLayer* parent) {
    cc::Layer* scroll_parent = nullptr;
    if (parent)
      scroll_parent = static_cast<WebLayerImpl*>(parent)->layer();
    layer_->SetScrollParent(scroll_parent);
  }
  
  void WebLayerImpl::setClipParent(blink::WebLayer* parent) {
    cc::Layer* clip_parent = nullptr;
    if (parent)
      clip_parent = static_cast<WebLayerImpl*>(parent)->layer();
    layer_->SetClipParent(clip_parent);
  }
  
  Layer* WebLayerImpl::layer() const {
    return layer_.get();
  }
  
  void WebLayerImpl::SetContentsOpaqueIsFixed(bool fixed) {
    contents_opaque_is_fixed_ = fixed;
  }
  
  void WebLayerImpl::setHasWillChangeTransformHint(bool has_will_change) {
    layer_->SetHasWillChangeTransformHint(has_will_change);
  }
  
  void WebLayerImpl::setPreferredRasterBounds(const WebSize& bounds) {
    layer_->SetPreferredRasterBounds(bounds);
  }
  
  void WebLayerImpl::clearPreferredRasterBounds() {
    layer_->ClearPreferredRasterBounds();
  }
  
  }  // namespace cc_blink
  